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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A348841 Number of primes with even exponents >= 2 in the prime power factorization of n!, for n >= 1.

Table of values

n a(n)
1 0
2 0
3 0
4 0
5 0
6 2
7 2
8 1
9 1
10 3
11 3
12 2
13 2
14 2
15 2
16 2
17 2
18 3
19 3
20 4
21 2
22 2
23 2
24 4
25 4
26 4
27 3
28 4
29 4
30 5
31 5
32 4
33 2
34 4
35 4
36 4
37 4
38 4
39 4
40 4
41 4
42 3
43 3
44 4
45 5
46 7
47 7
48 8
49 8
50 7
51 5
52 6
53 6
54 8
55 6
56 4
57 2
58 4
59 4
60 6
61 6
62 6
63 7
64 7
65 5
66 6
67 6
68 7
69 7
70 6
71 6
72 7
73 7
74 7
75 6
76 7
77 7
78 10
79 10
80 9

List of values

[0, 0, 0, 0, 0, 2, 2, 1, 1, 3, 3, 2, 2, 2, 2, 2, 2, 3, 3, 4, 2, 2, 2, 4, 4, 4, 3, 4, 4, 5, 5, 4, 2, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 4, 5, 7, 7, 8, 8, 7, 5, 6, 6, 8, 6, 4, 2, 4, 4, 6, 6, 6, 7, 7, 5, 6, 6, 7, 7, 6, 6, 7, 7, 7, 6, 7, 7, 10, 10, 9]

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